larskotthoff/data.csv

## data.csv

          
            key
            value
            date

            
              Group1
              37
              04/23/12

            
              Group2
              12
              04/23/12

            
              Group3
              46
              04/23/12

            
              Group1
              32
              04/24/12

            
              Group2
              19
              04/24/12

            
              Group3
              42
              04/24/12

            
              Group1
              45
              04/25/12

            
              Group2
              16
              04/25/12

            
              Group3
              44
              04/25/12

            
              Group1
              24
              04/26/12

            
              Group2
              52
              04/26/12

            
              Group3
              64
              04/26/12

## index.html
<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 10px sans-serif;
}

.axis path, .axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

</style>
<body>
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>

var format = d3.time.format("%m/%d/%y");

var margin = {top: 20, right: 30, bottom: 30, left: 40},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var x = d3.time.scale()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var z = d3.scale.category20c();

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom")
    .ticks(d3.time.days);

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var stack = d3.layout.stack()
    .offset("zero")
    .values(function(d) { return d.values; })
    .x(function(d) { return d.date; })
    .y(function(d) { return d.value; });

var nest = d3.nest()
    .key(function(d) { return d.key; });

var area = d3.svg.area()
    .interpolate("cardinal")
    .x(function(d) { return x(d.date); })
    .y0(function(d) { return y(d.y0); })
    .y1(function(d) { return y(d.y0 + d.y); });

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.csv("data.csv", function(data) {
  data.forEach(function(d) {
    d.date = format.parse(d.date);
    d.value = +d.value;
  });

  var layers = stack(nest.entries(data));

  x.domain(d3.extent(data, function(d) { return d.date; }));
  y.domain([0, d3.max(data, function(d) { return d.y0 + d.y; })]);

  svg.selectAll(".layer")
      .data(layers)
    .enter().append("path")
      .attr("class", "layer")
      .attr("d", function(d) { return area(d.values); })
      .style("fill", function(d, i) { return z(i); });

  svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + height + ")")
      .call(xAxis);

  svg.append("g")
      .attr("class", "y axis")
      .call(yAxis);
});

</script>
key	value	date
Group1	37	04/23/12
Group2	12	04/23/12
Group3	46	04/23/12
Group1	32	04/24/12
Group2	19	04/24/12
Group3	42	04/24/12
Group1	45	04/25/12
Group2	16	04/25/12
Group3	44	04/25/12
Group1	24	04/26/12
Group2	52	04/26/12
Group3	64	04/26/12
	<!DOCTYPE html>
	<meta charset="utf-8">
	<style>

	body {
	font: 10px sans-serif;
	}

	.axis path, .axis line {
	fill: none;
	stroke: #000;
	shape-rendering: crispEdges;
	}

	</style>
	<body>
	<script src="http://d3js.org/d3.v3.min.js"></script>
	<script>

	var format = d3.time.format("%m/%d/%y");

	var margin = {top: 20, right: 30, bottom: 30, left: 40},
	width = 960 - margin.left - margin.right,
	height = 500 - margin.top - margin.bottom;

	var x = d3.time.scale()
	.range([0, width]);

	var y = d3.scale.linear()
	.range([height, 0]);

	var z = d3.scale.category20c();

	var xAxis = d3.svg.axis()
	.scale(x)
	.orient("bottom")
	.ticks(d3.time.days);

	var yAxis = d3.svg.axis()
	.scale(y)
	.orient("left");

	var stack = d3.layout.stack()
	.offset("zero")
	.values(function(d) { return d.values; })
	.x(function(d) { return d.date; })
	.y(function(d) { return d.value; });

	var nest = d3.nest()
	.key(function(d) { return d.key; });

	var area = d3.svg.area()
	.interpolate("cardinal")
	.x(function(d) { return x(d.date); })
	.y0(function(d) { return y(d.y0); })
	.y1(function(d) { return y(d.y0 + d.y); });

	var svg = d3.select("body").append("svg")
	.attr("width", width + margin.left + margin.right)
	.attr("height", height + margin.top + margin.bottom)
	.append("g")
	.attr("transform", "translate(" + margin.left + "," + margin.top + ")");

	d3.csv("data.csv", function(data) {
	data.forEach(function(d) {
	d.date = format.parse(d.date);
	d.value = +d.value;
	});

	var layers = stack(nest.entries(data));

	x.domain(d3.extent(data, function(d) { return d.date; }));
	y.domain([0, d3.max(data, function(d) { return d.y0 + d.y; })]);

	svg.selectAll(".layer")
	.data(layers)
	.enter().append("path")
	.attr("class", "layer")
	.attr("d", function(d) { return area(d.values); })
	.style("fill", function(d, i) { return z(i); });

	svg.append("g")
	.attr("class", "x axis")
	.attr("transform", "translate(0," + height + ")")
	.call(xAxis);

	svg.append("g")
	.attr("class", "y axis")
	.call(yAxis);
	});

	</script>